Lock-washer.



W. H. FRY.

LOCK WASHER.

PLANOGRAPn cu.. wAsmNGroN. D. C.

lUNI'IED STATES PATENT OFFICE.

WILLIAM H. FRY, OF TUSCOLA, ILLINOIS.

LOCK-WASHER.

To all whom it may concern:

Be it known that I, VILLIAM H. FRY, a citizen of the United States,residing at Tuscola, in the county of Douglas and State of Illinois,have invented a new and useful LockfWasher, of which the following is aspecication.

This inve'ntion relates to nut locks, particularly to nut lockingwashers and has for an obj ect to provide a washer which will o peratein a new and novel manner to effectively prevent retrograde movement ofthe nut.

To this end the invention consists in providing the washer with a rigidsegmental ratchet tooth having its upper face beveled to permit a cornerof the flat Working face of the nut to freely slide over the same whenthe nut is advanced to nearly its linal position, and having its fiatedge standing on a chord of the washer and perpendicular to tlie nutengaging face of the washer whereby to snugly engage a lateral face ofthe nut when the latter is advanced to its final position, there being apair of alined rigid ribs formed on and projecting beyond thework-engaging face of the washer to engage the work and space themarginal edges of the washer therefrom so that there will be a certainresiliency of the washer to permit the segmental tooth to spring backand engage the lateral face of the nut when at the final turn of the nutthe said corner of its working face has passed over the inclined surfaceof the tooth.

For a more detailed description of the invention reference is to be hadto the accompanying drawing, in whichd Figure 1 is a side elevation of aclamping bolt and nut equipped with my improved nut locking washer. Fig.2 is a view in elevation of a clamping bolt and nut equipped with thenut locking washer, looking in the direction of the arrow head ofFig. 1. Fig. 3 is a perspective view ofthe work-engaging face of myimproved nut locking washer. Fig. 4 is a perspective view of the nutengaging face of the nut locking washer. Fig. 5 is a transversesectional view taken on the line A-B of Fig. 4. Fig. 6 is a transversesectional view taken on the line C-D of Fig. 4.

Referring to the parts by their reference characters, 1 and 2 designaterespectively Specicaton of Letters Patent.

Application filed December 15, 1909.

Patented Feb. 13, 1912.

Serial No. 533,196.

any usual bolt and nut therefor, in the present instance clamping a pairof bars, 3 and 4, together.

The nut locking washer comprising the subject matter of this inventionconsists of a circular washer having a segmental portion of its nutengaging face 5 thickened to provide a lratchet tooth 6 formed rigidwith the washer. The outer face of the ratchet tooth is inclined, asshown at 7, to provide a cam face upon which the flat working face ofthe nut 2 slides when the nut is advanced to nearly its final position.The flat edge S of the segmental ratchet tooth is disposed perpendicularto the nut-engaging face 5 of the nut locking washer and stands on achord across it, as shown. Arranged upon the work-engaging surface 9 ofthe washer and formed rigid therewith is a pair of alined ribs 10' whichare of the general contour shown in Fig. 3. The ribs 10 stand on adiametrical line across one face nearly parallel with the chord 8 on theother, so that the marginal edges of the work-engaging face of thewasher are spaced a slight distance from the work, as clearly shown inFig. 1. This space between the work and marginal edge of the washerpermits of that edge of the washer having the segmental ratchet tooth 6being depressed as a corner of the working face of the nut passes overthe cam face 7 during the nal turn of the nut upon the shank of thebolt.

The washer is constructed of resilient material so that as the corner ofthe nut passes beyond the ratchet tooth, the tooth bearing portion ofthe washer may spring back and force the flat edge 8 of the ratchettooth into frictional contact with a flat face of the nut so that thelatter is held positively against retrograde movement upon the shank ofthe bolt.

From the foregoing description, taken in connection with theaccompanying drawing, it is thought that the construction and operationof my invention will be easily understood without a more extendedexplanation, it being understood thatl various changes may be made inthe form, proportion and minor details of construction withoutsacriiicing any of the advantages or departing from the spirit of theinvention.

What is claimed is:

A nut locking washer formed in a single piece of resilient metal andhaving alining edge of said segment being arranged sulo- 10 projectionson one face forming diametristantially parallel With said line.

cally arranged knife edges constituting bear- In testimony that I claimthe foregoing ings for engaging a structure, there being a as my own, Ihave hereto affixed my signasegment projecting from the other face ofture in the presence of two Witnesses.

the Washer and gradually increasing in VILLIAM H. FRY. thickness fromone end to the other, all por- Witnesses:

tions of the segment being located at one side J. W. KAGEY,

of the line of the projections and the straight EMMA PECK.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

